Fluid tank



FIG. 1 is a front perspective view of a fluid tank;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown are included for the purposes of illustrating the unclaimed portion of the article and form no part of the claimed design. 

CLAIM The ornamental design for a fluid tank, as shown and described. 